const AGENT_MODE_SCOPED_CHAT_SUFFIX = "a93e17a60001";
const CHAT_UUID_REGEX =
  /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
const EMPTY_HISTORY_SCOPES = new Set(["canvas", "agent"]);

export function normalizeMessagesChatId(chatId: string) {
  const normalized = String(chatId || "").trim();
  const canvasPrefix = "canvas-";
  if (normalized.toLowerCase().startsWith(canvasPrefix)) {
    const rawCanvasId = normalized.slice(canvasPrefix.length);
    return CHAT_UUID_REGEX.test(rawCanvasId) ? rawCanvasId : normalized;
  }
  return normalized;
}

export function isValidMessagesChatId(chatId: string) {
  return CHAT_UUID_REGEX.test(String(chatId || "").trim());
}

export function isAgentModeScopedChatId(chatId: string) {
  const normalized = String(chatId || "")
    .trim()
    .toLowerCase()
    .replace(/-/g, "");

  return (
    /^[0-9a-f]{32}$/.test(normalized) &&
    normalized.endsWith(AGENT_MODE_SCOPED_CHAT_SUFFIX)
  );
}

export function isScopedEmptyHistoryRequest(params: {
  chatId: string;
  scope?: string | null;
}) {
  const scope = String(params.scope || "")
    .trim()
    .toLowerCase();
  return (
    EMPTY_HISTORY_SCOPES.has(scope) && isValidMessagesChatId(params.chatId)
  );
}